Alt H.W. free boundary problem involving a cusp: breakthrough of salt water / H.W.Alt,C.J. van Duijn, 1998. - 58 p. - Текст : непосредственный.
Duijn C.J. van Asymptotic results for injection of reactive solutes from a three-dimensional well / C.J. van Duijn,I.A.Guerra,M.A.Peletier, 2000. - 15 p. - Текст : непосредственный.
Duijn C.J. van Global existence conditions for a non-local problem arising in statistical mechanics / C.J. vanDuijn,I. A.Guerra,M. A.Peletier, 2001. - 21 p. - Текст : непосредственный.